I have the 18-55/3.5 and the 55-200/4
the 55-200/4 is a low end lens (only 225 new) and you see it available used all the time when people upgrade to a faster lens
I got mine for 160 used in perfect condition
if I were you I'd look for a used 55-200 to get your zoom and go with the tamron 90 for your macro
honestly, if you are willing to spend a little extra money I'd skip the 55-200 and get the 70-300/4 ($479 new, remember you need AF-S or AF-I....the regular AF version is only $200 new)
I would not give up 18-55, imagine only having that full 55 zoom all the time, you will want wider angle for some things
the tamron 90 macro lens is said to be great, so that will satisfy your macro wants
the tamron 90 is my next lens purchase
edit: summary
I'd do either of these options
1. keep 18-55, buy 55-200 and tamron 90
or, more expensive, but "better" option, IMO:
2. keep 18-55, buy 70-300 and tamron 90
option 2 will cost you about $300 extra over option 1